I have the same problem too and this is the solution I have come up with through research.

Since OWA is optimized for Interenet Explorer you CAN NOT use FireFox or Opera. But you can use the latest version of netscape. I believe it's still in beta stage. You can download it from netscape.com or cnet.com, but it has a handle little feature that no other browser has...yet. You can load pages that are optimized for IE but using an within Netcscape. Netscape has done this for people like us who have this issue. Please let me know if this helps or if you need more info you can email me at cbooth@weathermatic.com